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# -*- coding: utf-8 -*-
# Copyright 2017 New Vector Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import ujson as json
import logging
from canonicaljson import encode_canonical_json
from twisted.internet import defer
from synapse.api.errors import SynapseError, CodeMessageException
from synapse.util.async import Linearizer
from synapse.util.retryutils import NotRetryingDestination
logger = logging.getLogger(__name__)
class E2eRoomKeysHandler(object):
def __init__(self, hs):
self.store = hs.get_datastore()
self._upload_linearizer = async.Linearizer("upload_room_keys_lock")
@defer.inlineCallbacks
def get_room_keys(self, user_id, version, room_id, session_id):
results = yield self.store.get_e2e_room_keys(user_id, version, room_id, session_id)
defer.returnValue(results)
@defer.inlineCallbacks
def delete_room_keys(self, user_id, version, room_id, session_id):
yield self.store.delete_e2e_room_keys(user_id, version, room_id, session_id)
@defer.inlineCallbacks
def upload_room_keys(self, user_id, version, room_keys):
# TODO: Validate the JSON to make sure it has the right keys.
# XXX: perhaps we should use a finer grained lock here?
with (yield self._upload_linearizer.queue(user_id):
# go through the room_keys
for room_id in room_keys['rooms']:
for session_id in room_keys['rooms'][room_id]['sessions']:
room_key = room_keys['rooms'][room_id]['sessions'][session_id]
# get the room_key for this particular row
current_room_key = yield self.store.get_e2e_room_key(
user_id, version, room_id, session_id
)
# check whether we merge or not. spelling it out with if/elifs rather than
# lots of booleans for legibility.
replace = False
if current_room_key:
if room_key['is_verified'] and not current_room_key['is_verified']:
replace = True
elif room_key['first_message_index'] < current_room_key['first_message_index']:
replace = True
elif room_key['forwarded_count'] < room_key['forwarded_count']:
replace = True
# if so, we set the new room_key
if replace:
yield self.store.set_e2e_room_key(
user_id, version, room_id, session_id, room_key
)
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